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Make your future By putting limitations on the amount of information you will back up, you can be sure that certain limits won t be exceeded. Systems administrators may choose to put archive policies in place based on storage used. A typical policy might allow users to store up to 100MB of data on network shares for backup. If this amount is exceeded, certain data can be either archived or removed from the backup schedule. Politically, this can be quite challenging to implement, but it might make sense when data protection costs are significant and increasing faster than budgets.
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Based on these guidelines, you ll get a good estimate of the amount of information you want to protect. Keep in mind that the numbers do not have to be exact. As we ll see, backup products come in a variety of capacities. If you re lucky, the choice for your organization, based on data requirements, speed, and budget, will be quite obvious. Otherwise, you can always choose to err on the side of safety by choosing a solution that will scale well in the future.
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The "Recovery Window"
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As I explained in 1, Evaluating Corporate Data Requirements, it's important to ensure that the data protection solution you choose is capable of restoring your data within an acceptable timeframe. The decisions you make regarding your recovery requirements will greatly affect the types of products you select. Let s look at an example of where this information is useful. Suppose you have a database server that is used heavily during the day, but there is a period of six hours in which backups can be performed. Based on this information alone, you might decide upon a solution that provides for backing up information during this period. If you later learn that managers expect at most one hour of downtime during critical business hours, you probably will not be able to meet these recovery requirements with the given hardware. Various methods for recovering data may be employed to meet these goals. For example, redundant hardware and disaster recovery options (described later in this chapter) can greatly reduce recovery times.
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Live vs. Offline Database Backups
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Before we begin evaluating the hardware and software tools that we ll need for data protection, it s important that we distinguish between two different types of database backups. (We ll look at the technical details of each option in 6, Performing Database Backups. ) One of the main complications involved in backing up database files is that they are generally in use or live during backups. This makes simple file copy operations difficult to perform, since the database server must be stopped before the files are accessed. The live backup process is diagrammed in Figure 5-1. One way to circumvent the issues associated with a live backup is simply not to back up any data files that are open and in use. In an offline backup system, which is depicted in
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Figure 5-1.
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A live database backup
Figure 5-2, you regularly schedule the data to be dumped to another file that is not directly accessed by the database server. This dump file can then be backed up offline, along with any other files on the system. In the event that a restoration is required, the systems administrator can reload the data from the dump file into the database. The disadvantage to offline backups is that creating dump files can negatively affect performance especially that of the disk subsystem and can require large amounts of disk space that is essentially useless for any purpose other than backups. There are actually many reasons for performing live backups of your databases. Perhaps the most common is the volume of data. As we ll see later in this chapter, disk resources can be considerably more expensive than tape storage. Large databases consume much disk space that might otherwise be used by clients. Figures 5-1 and 5-2 show the difference between live and offline backups. Another reason for performing live database backups is performance. Creating dump files can use CPU and memory resources, and thus degrade the overall performance of the server. In situations where database server availability and performance is critical around the clock, live backups may need to be performed whenever possible.
Figure 5-2.
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